There are new story branches, equipment, upgrades, text adventures and planetary conflicts. Most importantly for today's PCs are the higher supported resolutions.
These new-fangled operating systems have gotten full support too, so crank up that art 1920x1200. There are modern render techs used for planetary battles.
Space Rangers HD: A War Apart is set in the year 3300AD. "Our galaxy is invaded by the Dominators, combat robots that come under the influence of an alien technology. Players find themselves in a living, breathing world where they can engage in multiple activities: fight in space and hyperspace, trade, accomplish government missions, liberate planets from the Dominators in 3D RTS battles and complete text adventures leading to unique plot twists and rewards."
"The game ending is not set and players may find a victory of either side at the end – anybody can live the life of a pirate as well as that of a hero. All player actions affect what kind of place the Galaxy will be at the end."
Space Rangers HD: A War Apart releases on PC October 17th, and requires Steam to run.